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Crosshatch Paint Adhesion Test Kit (P.A.T. Kit)


Meets ASTM Test Method D3359, F1842; ISO 2409; Method B; DIN Standard No. 53151

The Crosshatch Paint Adhesion Test Kit (P.A.T.) produced by Gardco is a visual adhesion test used for evaluating adhesion by cutting the paint or coating into small squares, thereby reducing lateral bonding. The adhesion test kit for paint and coatings contains all of the tools and materials needed, except for the multi-tooth cutter blade, for conducting adhesion tests on paints applied to a flat, uniform surface in accordance with ASTM Test Method D3359, method B and DIN Standard No. 53151. The multi-tooth cutter blade is furnished separately to permit choice among the various available designs.

The kit includes the blade holder / handle with guide, hex wrench for changing blades, flaking brush, 5x LED hand held magnifier w/batteries (magnifier has 2 LED lights and 1.5" glass lens), tape - PA-280630*, instruction guide, and a sturdy plastic carrying case with handle. All of the components are nested in diecut foam within the case. * Permacel #99 test tape no longer available. Currently supplying PA-280630 (51596)Polyester Rope Fiber Laminate.

ASTM Standard not included, available for purchase below

CLICK HERE to view the Variable Spaced Multi-Tooth Cutter





The new ergonomic handle design gives comfortable and precision control in cross hatch testing. It helps keep your hand in a natural position, preventing strain and fatigue. One handle for both the right or left handed person. Due to the accuracy of the spacings and the speed with which the test can be conducted, the multiple tooth cutter is the preferred tool for use in this test except when evaluations must be made on coatings applied to surfaces which are neither flat or relatively smooth. Under these adverse conditions a single razor blade type cutter is often desirable under method A of ASTM. A Multi-Tooth Adhesion Cutter for pipe is also available.

Multiple tip cutters are available with guide teeth and six spaced teeth at 1.0 and 2.0mm. The 1.0mm spacing is also available with eleven teeth and guide teeth. Available without guide teeth are cutters with eleven spaced teeth at 1.5mm. Also note other cutter blades illustrated in the dimensional drawings. (Ask for information on special variable spaced cutters and cutters for curved surfaces.)

PAT Test KitBlade Not Included


Cross Hatch Testing Operation

  1. Prepare test specimen as outlined in ASTM D3359.
  2. Position the blade in the handle with the holes facing the securing set screws, take care not to over tighten.
  3. Place the cutter assembly on the test specimen so that the guide and cutter rests on the substrate.
  4. Grasp handle and rotate it upward with respect to the line of contact of the guide with the test surface. During this motion, the tips of the cutter first contact the test surface when the top of the handle is about seven degrees with respect to the test surface. Continue this motion until the top surface of the handle is elevated to about 15 degrees. This is the correct attitude of the cutter assembly for the test.
  5. Apply enough pressure on the handle to insure that all of the cutter tips penetrate the test specimen supporting base, pull assembly along the test surface through 0.75 to 1 inch. Repeat this procedure with a second cut intersecting the first pattern at 90° (±5°). Evaluate results of the test as indicated in ASTM D3359, method B.


Classification Chart

PAT Classification Chart


Tips on the Use of Cross Cut Blades

Before shipment, our blades must pass a cutter blade tooth accuracy inspection check. You can periodically check the accuracy of your cutter blade in the same manner. Use a small piece of polished plate glass. With a match or lighter, smoke a portion of the glass. This will leave an extremely black thin film. With the blade mounted in the handle, pull it across the film. All teeth should make tracks. If all teeth do not touch when used on a coated panel it will indicate that the panel surface is not plane or one or more of the teeth have been damaged. Cross Cut Blade
Some customers using the cross-cut (or cross-hatch) adhesion blades have had problem getting all the teeth to cut evenly through their coating. From our experience, we have found that uneven cutting is usually due to warped panels. When using the crosscut blades, it is important that the panel being scratched be supported by a flat, rigid table or surface. Additionally, sufficient force must be used for the blades to cut completely through the coating. Often this is a catch-22 situation. If your panel is not supported sufficiently, then more applied pressure simply bends the panel.




The multiple tip cutters for the Paint Adhesion Test Kit are specially designed to provide optimum results. Not only are they produced to very close tolerances but also, as a final step in production they are given a black oxide coating (bluing) to prevent rusting.

Handle mounting holes do not go all the way through the cutter. This prevents the cutter from being improperly secured in the handle. The holes must face the securing set screws.

A further very important improvement to the multiple tip cutter is not immediately apparent. Even with the best possible production tools and procedures, it is very difficult to hold the tolerance on individual tooth length closer than ±0.0005 inches. Even this very small variation is just not good enough for best results from the test. An additional last step in the production process provides essentially zero tolerance on blade length.

The cutters are first produced to insure a normal cut. This is then followed by a fine lateral honing which slightly modifies the teeth. There are Several Advantages: The teeth are stronger and less subject to damage. There is a cleaner edge cut where the coating interfaces with the supporting base. Cutter life is increased. The tolerance on tip length is greatly improved permitting lower pressure to be used on the cutter and avoiding gouging of the supporting base with a long tip.

As general guide for coatings having a dry film thickness up to and including 2.0 mils (50 µm) space the cuts 1 mm apart and make eleven cuts (PA-2053) unless otherwise agreed upon. For coatings having a dry film thickness between 2.0 mils (50 µm) and 5 mils (125 µm), space the cuts 2 mm apart and make six cuts (PA-2056) unless otherwise agreed upon. For coatings having a thickness greater than 5 mils (125 µm) space the cuts 5.0 mm apart and make 5 cuts (PA-2253) unless otherwise agreed upon.


Cutter Blade Dimensions

Note:  For 2.0mm blade, the two outer "outrigger" teeth are for stability only

PA-2253 (5 Tooth 5.0mm Cutter) PA-2055 (11 Tooth 2.0mm Cutter)


For Conducting adhesion tests on coatings having a thickness
greater than 5 mils (0.005") (125 microns).


PA-2257 (16 Tooth, 1.6mm spacing)


PA-2050 Variable Spaced Multi-Tooth Adhesion Cutter

The most popular multiple tooth adhesion cutters and related items now in use are those designed, manufactured and sold by the Paul N. Gardner Company. These cutters are available with the following tooth spacing which provides a crosshatch of segments with the indicated area:
Tooth Spacing mm Segment Area Square mm
1.00 1.00
1.50 2.25
2.00 4.00
3.00 9.00

The variable spaced multiple tooth cutter has 14 teeth providing 13 spaces between the teeth ranging from 0.46 mm to 2.58 mm.

This spacing provides segment areas ranging from 0.21 square mm to 6.66 square mm. At the left below is a sketch of the cutter and at the right is shown a pattern of the crosshatch cuts obtained.



Segment Area Table

Segment Area Table
The following table shows the segment area in square mm for each of the segments in the variable spaced multi-tooth crosshatch pattern.
Tooth Spacing in mm 0.46 0.53 0.61 0.71 0.82 0.94 1.09 1.26 1.45 1.68 1.94 2.24 2.58
Segment Area in
Sq. mm
1.19 1.37 1.57 1.83 2.12 2.43 2.81 3.25 3.74 4.34 5.01 5.78 6.66
1.03 1.18 1.36 1.59 1.83 2.10 2.44 2.82 3.24 3.75 4.34 5.01 5.77
0.89 1.03 1.18 1.37 1.59 1.82 2.11 2.44 2.81 3.25 3.75 4.33 4.99
0.77 0.89 1.02 1.19 1.37 1.58 1.83 2.11 2.43 2.82 3.25 3.75 4.32
0.67 0.77 0.89 1.03 1.19 1.36 1.58 1.83 2.11 2.44 2.82 3.25 3.75
0.58 0.67 0.77 0.89 1.03 1.18 1.37 1.58 1.82 2.11 2.44 2.82 3.24
0.50 0.58 0.66 0.77 0.89 1.02 1.19 1.37 1.58 1.83 2.11 2.44 2.81
0.43 0.50 0.58 0.67 0.77 0.89 1.03 1.19 1.37 1.58 1.83 2.11 2.43
0.38 0.43 0.50 0.58 0.67 0.77 0.89 1.03 1.18 1.37 1.58 1.83 2.11
0.33 0.37 0.43 0.50 0.58 0.66 0.77 0.89 1.03 1.19 1.37 1.58 1.82
0.29 0.33 0.38 0.44 0.51 0.58 0.68 0.78 0.90 1.04 1.20 1.39 1.60
0.23 0.27 0.31 0.36 0.41 0.47 0.55 0.63 0.73 0.85 0.98 1.13 1.30
0.21 0.24 0.28 0.33 0.38 0.43 0.50 0.58 0.67 0.77 0.89 1.03 1.18


Radiused Tooth Cutter for Pipe - 1mm Blade Only

Multi-tooth adhesion cutters available to date may be used only on materials applied to a flat surface. There have been numerous requests, however, for adhesion cutters for use on uniform curved surfaces such as pipe. The uniform 1 mm six tooth cutter is now available for use on such surfaces where the radius of curvature is no less than 0.75 inches. The dimensions for a cutter to be used on 0.75 inch radius pipe is shown in the following sketch:

This special cutter for materials applied to simple curved surfaces is produced from a modified standard multi-tooth cutter. The
rake angle (the angle of the tooth tip to the back of the cutter) is accurately known.

Therefore, by removing a portion of the front surface of the cutter, the tooth is shortened by a known amount. Since the shortening of the tooth is proportional to the thickness of cutter removed, the cutter may be produced to work on any given radius of curvature above a practical limit of 0.75 inches.


Use of Cutter

The cutter for curved surfaces is mounted in the same size and style of handle as all other GARDCO
multi-tooth adhesion cutters. The handle, however, is special in that the center portion of the nylon protector is notched to assist in correctly orienting the cutter on the curved surface.






Prices subject to change    Prices listed in US dollars for domestic shipments within US    For tax exempt orders please call us at 954-946-9454
Item Number Item Prices
PA-2000 Kit

Kit includes the blade holder / handle with guide, hex wrench for changing blades, flaking brush, 5x LED hand held magnifier w/batteries (magnifier has 2 LED lights and 1.5" glass lens), tape - PA-280630*, instruction guide, and a sturdy plastic carrying case with handle. All of the components are nested in diecut foam within the case. (ASTM D3359 Reprint is not included, can be purchase separately below PA-2808)

PA-2000 PAT 2000 Kit (Blade not included)
Blades (Specify Teeth Spacings) - Order blades with kit to avoid additional shipping charges
PA-2052 Fine Blade (1.0mm spacing) 6 Teeth
PA-2053 Fine Blade (1.0mm spacing) 11 Teeth
PA-2054 Medium Blade (1.5mm spacing) 11 Teeth
PA-2055 Special Coarse Blade (2mm spacing) 11 Teeth
PA-2056 Coarse Blade (2.0mm spacing) 6 Teeth
PA-2057 Very Coarse Blade (3.0mm spacing) 6 Teeth
PA-2251 Coarse Blade (2.4mm or 3/32"spacing) 4 teeth
PA-2253 Thick Coatings (5.0mm spacing) 5 Teeth
PA-2257 API RP 5L2 (1.6mm spacing) 16 Teeth
PA-2054/TC Carbide Tip (1.5 mm spacing) 11 Teeth
Variable Spaced Blade
PA-2050 Variable Spaced Cutter 14 Teeth
PA-280630* Roll Tape - (Polyester Rope Fiber Laminate) Adhesion Test Tape
PA-284105 Roll Tape - Nichiban PAT Tape
PA-7000 Kit

Kit includes (2) PA-205810 blade holder / handle with guide with nylon protector and guide, hex wrench for changing blades, flaking brush, 5x LED hand held magnifier w/batteries (magnifier has 2 LED lights and 1.5" glass lens), tape - PA-280630*, instruction guide, and a sturdy plastic carrying case with handle. All of the components are nested in diecut foam within the case. Blades sold separately [choose two (2) cutters for curved surfaces below]

PA-7000 PAT 7000 Kit $295.00
Radiused Blades (Made to Order)
7000 Series Blades: (Specify Any Radius Above 0.75 Inches) Note: Cutters are available only in pairs, made to order on radius specification.
EXAMPLE: PA-7150 - Two (2) Six Tooth Blades, 1 mm Spacing, 1.5" Radius Cutter for the Trans radius cut, plus you will also need a PA-2052 straight blade for the longitudinal cut (sold separately). 786.00
All GARDCO blades qualify under MIL STD 45662A and conform to ISO 9000 when ordered with calibration certification (Add /C to blade order number) add $227.00 to price.
Replacement Parts for both PAT Kits
PA-205810 Blade Handle with Clamp Screws & Hex Wrench (For Variable Spaced Cutters)
PA-2060 Clamp Screws (2)
PA-2062 Hex Wrench
PA-280203 5x LED Magnifier with Batteries
PA-2810 Rugged Carrying Case with laminated die-cut foam insert 30.00
PA-2804 Brush, scrub brush
PA-2808 ASTM D3359 Reprint
* Permacel #99 test tape no longer available. Currently supplying PA-280630 (51596) Polyester Rope Fiber Laminate. Click here for more information.
Disclaimer: Although Paul N. Gardner Company, Inc. has attempted to provide accurate information, the Paul N. Gardner Company, Inc. assumes no responsibility for the accuracy of the information.


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